| 0 | NA 88940 | 24Flam60 | Rhododendron flammeum (Michx.) Sarg. | South Carolina, United States | NA | | | 2025 | COLLECTED | 09/13/2025 | Savannah River Site, near Tinker Creek. GPS coordinates represent a general location for the population. | 33.36802000, -81.54971000 | 90 | Shady forest following Tinker Creek. Seed collected primarily on slopes and banks over the creek. Growing in half shade. Slope: Varying. | Wild material | Note: Two field collections, 24Flam60 and 24Flam65, were combined together in this USNA accession, with the former identifier being used as the primary one. The collectors note the possibility that this contains hybrids because the plants were not observed in flower. | 2172823 | NA 88940 |
| 1 | NA 88941 | 24Flam74 | Rhododendron flammeum (Michx.) Sarg. | South Carolina, United States | NA | | | 2025 | COLLECTED | 09/13/2025 | Savannah River Site: banks of Tinker Creek. GPS coordinates represent a general location for the population. | 33.37216000, -81.53749000 | 94 | Banks of creek. Growing in 3/4 shade. | Wild material | Note: Five field collections (24Flam72, 24Flam72.5, 24Flam74, 24Flam75, and 24Flam78) were combined together in this USNA accession, with the lowest identifier being used as the primary one. The collectors note the possibility that this contains hybrids because the plants were not observed in flower. | 2172824 | NA 88941 |
| 2 | Ames 33965 | JDC/PG/2017/013/767 | Populus grandidentata Michx. | Iowa, United States | NC7 |  | | 2017 | COLLECTED | 05/07/2017 | Private property approximately 2.98 miles west of Luther, T83N R26W NE 1/4 SE 1/4 NE 1/4 Sec. 28., Boone County | 41.97486900, -93.87548500 | 328 | Woodland. Deciduous forest. | Wild material | The native range of Populus grandidentata is concentrated througout the northeastern United States with disjunct populations in far south as Kentucky and as far west as central Iowa (Little, E. L. Jr. 1971). Bigtooth aspens are known to be fast-growing trees, making for a quick source of shade in the landscape. As a pioneer species in nature, P. grandidentata is adaptable to a wide range of environments but is considered to be slightly less adaptable than quaking aspen. However, bigtooth aspen is more resistant to canker diseases than quaking aspen (Laidly 1990), potentially making it slightly longer-lived. Bark on big-tooth aspens is generally greyish to greyish-yellow or olive-green compared to quaking aspens where bark is typically white to greyish-white. Leaves and leaf serrations are larger, and the degree of suckering is lower in big-tooth aspens. Both species are well known for their leaves to quake or tremble as the lengthy petioles allow leaves to swivel in the slightest amount of wind. Populus use is well-documented throughout the world and encompasses a wide range of products including energy feedstock, wood chips for pulping fibers, veneer logs, agro-forestry, and phyto-remediation as well as several other environmental applications. Interspecific hybrids of P. grandidentata and P. canescens have superior performance in yield; Hypoxylon canker resistance; and rooting ability compared to pure, N. American aspen genetics. This accession represents genetics acquired from the Des Moines River Valley of central Iowa and considered a disjunct population. P. grandidentata is infrequent to somewhat common throughout parts of the Des Moines River Valley, but very localized. The next closest, native population would be found in Hardin County (Iowa) approximately 50 miles to the northeast near Eldora. In central Iowa, this accession has been noted to have excellent, yellow fall color that typically peaks in mid-October (e.g. 21 October 2015). Fruits usually mature in early May (e.g. 3 May 2017) coinciding with flower initiation on local genotypes of Prunus virginiana. Specimens sampled in nature measuring approximately 60' in height and 16-22" dbh. Due to this accession originating from the western and southern edge of the species native range, it is suspected that this accession would have excellent heat and drought tolerance compared to genetics from areas in the northeastern U.S. | 1949856 | Ames 33965 |